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elimination method of 7x + 2y=19 and 7x + 8y=13​

Sagot :

Answer:

Subtract : 7x + 2y = 19

-7x + 8y = 13

this is equal to -6y=5 where y will be equal to -5/6

then let y= -5/6

choose any equation

let have 7x + 2(-5/6) = 19

=> 7x + -5/3 = 19

=> 7x = 19 + 5/3

=> 7x = 62/3

x= 62/3 divided by 7

x= 434/3

on the other hand

x for the other equation would be 79/21